New Orleans is the center of the New Orleans Metropolitan Area, the largest metro area in the state. The city is often referred to as the most unique city in America. It is world-famous for its abundance of unique architectural styles, which reflects the city's historical roots and multicultural heritage. The city has seventeen historic landmark districts. New Orleans is also noted for its large, European-style Catholic cemeteries, which can be found throughout the city. The New Orleans area is home to numerous celebrations, the most popular of which is Carnival, often referred to as Mardi Gras. The largest of the city's many music festivals is the New Orleans Jazz & Heritage Festival. Commonly referred to simply as Jazz Fest, it is one of the largest music festivals in the nation, featuring crowds of people from all over the world. The city has many major attractions, from the world-renowned French Quarter and Bourbon Street's notorious nightlife to St. Charles Avenue (home of Tulane and Loyola Universities, the historic Pontchartrain Hotel, and many 19th century mansions), to Magazine Street, with its many boutique stores and antique shops.